The study aims at investigating how revenue management techniques can be applied in industries which offer multiple products. Most of the companies nowadays trend to produce multiperoducts and they try to find the best method of selling. Therefore, revenue management can be considered as a new direction which should be developed for these firms. In this study, multi-product firms are mainly referred as firms offering a bundle of products or substitute products. In this regard, models and techniques applied in multiproduct firms are discussed and it is tried to provide basic models to better understand the problems, variables, customer choice models and constraints. The main methodology in this study is literature review. In order to carry out the research first revenue management applications and techniques are discussed to find a fit to this kind of industries. The main findings of this study are (1) identifying and analyzing the most important factors affecting decision making regarding managing of bundling and substitute products and ultimately total revenue of multiproduct firms. (2) Summarizing the results and knowledge obtained from various studies within fields of bundling and substitute products. (3) Discussing the possibility of applying different revenue management techniques to these fields. (4) Identifying potentials and new directions for future study with respect to both revenue management techniques and multiproduct firms.